US4691602A - Punch and ejector assembly - Google Patents

Punch and ejector assembly Download PDF

Info

Publication number
US4691602A
US4691602A US06/301,951 US30195181A US4691602A US 4691602 A US4691602 A US 4691602A US 30195181 A US30195181 A US 30195181A US 4691602 A US4691602 A US 4691602A
Authority
US
United States
Prior art keywords
assembly
punch
section
ejector
punch member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/301,951
Inventor
Edward Schlueter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US06/301,951 priority Critical patent/US4691602A/en
Application granted granted Critical
Publication of US4691602A publication Critical patent/US4691602A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26DCUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18Means for removing cut-out material or waste
    • B26D7/1818Means for removing cut-out material or waste by pushing out
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/202With product handling means
    • Y10T83/2092Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096Means to move product out of contact with tool
    • Y10T83/2122By ejector within a hollow cutter
    • Y10T83/2133By resiliently biased ejector
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/202With product handling means
    • Y10T83/2092Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096Means to move product out of contact with tool
    • Y10T83/2135Moving stripper timed with tool stroke
    • Y10T83/215Carried by moving tool element or its support
    • Y10T83/2155Stripper biased against product
    • Y10T83/2159By spring means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/202With product handling means
    • Y10T83/2092Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096Means to move product out of contact with tool
    • Y10T83/2135Moving stripper timed with tool stroke
    • Y10T83/2163Stripper biased against product
    • Y10T83/2166Spring biased stripper

Definitions

  • the instant invention is directed to a piercing punch and ejector assembly. More particularly, the instant invention is directed to a piercing punch and ejector assembly charaterized by increased operating life, reduced downtime and maintenance requirements and simpler design than the assemblies of the prior art.
  • Piercing punch and ejector assemblies are fundamental tools employed in the machining and material forming arts. These assemblies include a piercing punch member which cuts out a slug or blank and an ejecting means member which insures that the cut out slug or blank does not adhere to the cutting edge face of the piercing punch member.
  • piercing punch and ejector assemblies have included a spring actuated ejecting pin disposed in a bore provided in the point thickness section, or beyond, of the piercing punch member.
  • a spring situated in a counterbore in the body and shoulder thickness sections of the punch member, urges the ejection pin outward beyond the surface of the cutting edge of the punch member.
  • Another limitation of the typical piercing punch and ejector assembly of the prior art is the difficulty associated with disassembly of the ejector means during the periodic sharpenings of the cutting edge of the piercing punch member. This periodic sharpening is necessary to extend the life of the punch member. During this sharpening the ejector means, disposed in the bore and counterbore of the punch member, is removed. The removal and reinsertion of the ejector means requires total disassembly of the punch and die apparatus in that access to the counterbore end of the punch is required.
  • ejector pin designs have been advanced that eliminate much of the difficulty involved in removal of the ejector means. Specifically, ejector pin designs have been developed in which only the ejector pin is removed, and thereafter reinstalled, during sharpening. In other designs, the ejector pin is held in the retracted position during sharpening.
  • a complex ejector means design must be employed. This adds significant complexity and cost to the punch and ejector assembly.
  • the use of an ejector pin in a piercing punch and ejector assembly requires time consuming and labor intensive maintenance cost or, in the alternative, a highly complex and expensive design.
  • a related problem, associated with the sharpening of piercing punch members, in the prior art is the limitation on the number of times the punch member may be rehoned before the punch member is discarded. Each time the punch member is resharpened its length is correspondingly decreased. Although this has no adverse effect on the typical ejector pin design in the unrestrained position, since it only causes the pin to extend further beyond the cutting edge surface, it has a very deleterious effect on the punch and ejector assembly in the retracted position. After enough resharpenings there is an insufficient length of bore to accommodate the ejector pin when the ejector means spring is compressed and the ejector pin retracted. Since ejector pins are manufactured in standard lengths, a new shorter pin cannot replace the original longer pin with the result that the whole assembly must be replaced.
  • the piercing punch and ejector assemblies of the prior art suffer from limitations in terms of their strength of construction, their difficult and time consuming maintenance requirements or complex and expensive design, and their limited effective working life.
  • the instant invention is directed to a new piercing punch and ejector assembly which provides improved strength of construction, a simplified design which provides simplified and less time consuming maintenance and longer effective useful life. This is all accomplished in an improved assembly that employs a blind hole eliminating the through hole design of the prior art and that eliminates the need for an ejection pin which simplifies maintenance, decrease the cost of both the punch member and the ejection means and increases assembly working life.
  • a piercing punch and ejector assembly comprises a piercing punch member having a point thickness section provided with a longitudinal bore.
  • An ejector member is also provided. It includes a conical helical spring of rectangular cross section disposed in said bore.
  • FIG. 1 is a longitudinal cross sectional view of a preferred embodiment of the piercing punch and ejector assembly of this invention
  • FIG. 2 is a detailed longitudinal cross sectional view of a portion of the assembly of FIG. 1;
  • FIG. 3 is a front elevational view of the conical helical spring of this invention.
  • FIG. 4 is a flat pattern isometric view of the spring of FIG. 3;
  • FIG. 5 is a longitudinal cross sectional view of the punch and ejector assembly in operation.
  • the assembly 1 includes a piercing punch member depicted generally at 2.
  • the piercing punch member 2 comprises a point thickness section 4, a body thickness section 6 and a shoulder thickness section 8.
  • the punch member 2 is characterized by a blind hole provided therein.
  • the term "blind hole” is used to emphasize the fact that a bore 10 is provided only in the point thickness section 4 of the punch member 2. That is, an opening 10 extending from the cutting edge surface 7 upwards as high as the top of the point thickness section 4 of the member 2 is provided.
  • the point thickness section 4 is that portion of the piercing punch member 2 having a thickness, most often a diameter, equal to the thickness of the cutting edge 7.
  • the body thickness section 6 disposed above and integral with the point thickness section is characterized by a uniform thickness equal to that of the bulk of the punch member 2.
  • the shoulder thickness section 8 is that uppermost section of the punch member 2 wherein the thickness is greatest defining the shoulder of the punch 2.
  • the section 8 is integral with the point and body thickness sections, 4 and 6.
  • the body and shoulder sections 6 and 8 are characterized by a solid shape since the bore 10 extends only within the point thickness section and there is no counterbore.
  • a unique feature of the assembly 1 is the inclusion of a plug or core 12 placed at the end of the bore 10 remote from the cutting edge surface 7.
  • the punch member 2 is constructed of a hard metal, well known to those skilled in the art
  • the core 12 is formed of an easily drilled, soft material.
  • the materials that can be used as the material of construction of the core 12 are aluminum, copper, cold rolled steel and plastics. Of these aluminum is particularly preferred.
  • the use of the core 12 provides the important advantage of extending the life of the punch member 2.
  • the cutting edge 7 of the punch member 2 is periodically resharpened to extend the useful life of the punch.
  • this expedient extends the punch life, the number of times such a procedure can be repeated is limited.
  • the punch member 2 must be replaced. This is because the punch member 2 is constructed of a very hard metal, necessary to prevent structural failure during its operation. Thus, it is exceedingly difficult to drill into such a metal to extend the length of the bore 10.
  • the design of the piercing punch member 2 provided with the core 12 overcomes this problem. Obviously, it is quite simple to drill into the soft material core 12 resulting in an extension in the number of tixes the cutting edge 7 can be rehoned. It is important to appreciate that this method increases the number of times the punch member 2 can be resharpened without diminishing its structural strength. This is because the bore length need not ever be increased beyond its original length. The bore 10 need only be increased, by decreasing the length of the core 12 after continued sharpenings, to its original length.
  • the piercing punch and ejector assembly 1 includes an ejector means, generally indicated at 5.
  • the ejector means 5 comprises a conical helical spring of rectangular cross section 9.
  • the conical helical spring 9 is best depicted in FIG. 3. As seen in FIG. 3, the spring has an ever increasing diameter, resulting in a cone shaped appearance. In the drawings the small diameter end is denoted 14 and the opposite end, the large diameter end is denoted 16.
  • a conical helical spring of rectangular cross section is particularly suited to this application. Unlike most forms of springs, this type spring can be squeezed. Thus, its maximum diameter, i.e., end 16, can exceed the diameter of the bore 10 and yet be capable of being placed into the bore 10.
  • the conical helical spring of rectangular cross section 9 is additionally characterized by its ability to fold into itself such that its length can be reduced to that of its width, illustrated in the drawings at 18.
  • the ability of the spring 9 to decrease its thickness to this significant degree, without adversely affecting its spring power imparts another significant advantage to the punch and ejector assembly 1. Because the ejector means length can be decreased the bore 10 can also be proportionately decreased without any deleterious effect. Therefore, the cutting edge surface 7 of the punch member 2 can be resharpened many times, even to the point of decreasing the length of the point thickness section 4, and hence, the length of the bore 10, without adversely affecting the operation of the assembly 1.
  • the bore 10 may be as short as the width 18 of the spring 9 and the assembly 1 will still function, since the retracted spring 9 will still be accommodated in the bore 10. This feature adds yet further useful life to the assembly even before the improved feature provided by the core 12 is put into effect.
  • the conical helical spring of rectangular cross section 9 is shown in a flat pattern view in FIG. 4. Its width 18 and thickness 19 defines its rectangular cross section. Its length 20 and helical angle 21 defines the shape of the cone depicted in FIG. 3.
  • the material of construction of the spring 9 is most preferably a hard metal. Among the hard metals preferred for employment in this application are stainless steel, carbon steel, beryllium copper and phosphorus bronze.
  • the piercing punch and ejector assembly 1 is held in a punch shoe 30 and punch retainer 40.
  • the shoe 30 and retainer 40 are secured together by conventional means well known to those skilled in the art (not shown).
  • a die retainer 50 and a die shoe 60 are in vertically aligned, spaced relationship with the punch shoe 30 and retainer 40 disposed thereabove.
  • a die insert 52 is accommodated in the die retainer 50 as shown in the drawing.
  • An opening 64 is cut into the die shoe 60 in vertical alignment with the punch member 2 and the die insert 52.
  • a stripper plate 45 is located intermediate the punch retainer 40 and die retainer 50 and in vertical alignment therewith. The stripper plate 45 includes an opening 46 to permit movement of the punch member 2.
  • the material from which the plugs or blanks will be formed is disposed upon the die retainer 50. As shown in FIG. 5, it is impacted by the cutting edge 7 of the punch member 2 which simultaneously compresses and retracts the spring 9 into the bore 10 such that the small diameter end 14 of the spring 9 is flush with the cutting edge surface 7 at the point of impact.
  • the conical helical spring 9 remains in this retracted position until the punched out material, the plug or blank 72 is cut from the stock 70.
  • the blank 72 is depicted in FIG. 5 in dotted line falling in the passageway formed by the opening in the die insert 52 and the opening 64 in the die shoe 60. After impact the compressive force on the spring 9 is removed and the conical spring 9 expands to the position shown in FIGS.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

A piercing punch and ejection assembly has a piercing punch member provided with a bore in its point thickness section. The ejector member, included in the assembly, comprises a conical helical spring of rectangular cross section that is installed into the blind hole bore of the punch member.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The instant invention is directed to a piercing punch and ejector assembly. More particularly, the instant invention is directed to a piercing punch and ejector assembly charaterized by increased operating life, reduced downtime and maintenance requirements and simpler design than the assemblies of the prior art.
2. Description of the Prior Art
Piercing punch and ejector assemblies are fundamental tools employed in the machining and material forming arts. These assemblies include a piercing punch member which cuts out a slug or blank and an ejecting means member which insures that the cut out slug or blank does not adhere to the cutting edge face of the piercing punch member.
Typically, piercing punch and ejector assemblies have included a spring actuated ejecting pin disposed in a bore provided in the point thickness section, or beyond, of the piercing punch member. A spring, situated in a counterbore in the body and shoulder thickness sections of the punch member, urges the ejection pin outward beyond the surface of the cutting edge of the punch member.
Although these designs function to punch slugs or blanks from working stock they present important design, operation and maintenance problems to workers in this art. This has resulted in the development of improved designs to overcome these perceived defects. However, these designs still retain an ejection pin. Since, there are certain inherent limitations in the utilization of spring activated ejector pins, no number of design changes can completely overcome these shortcomings.
One of these design limitations is the requirement that the bore and counterbore, required to accommodate the ejection pin, the spring and additional means necessary to hold the pin and spring in place, i.e., a set screw, a collar and the like, extends longitudinally from one end of the punch member to the other, from the cutting edge to the top of the shoulder. This "through hole" effectively makes the piercing punch member a tubular instrument. Obviously, a tubular punch is a weaker tool than the same punch constructed substantially solid. This defect is even further accentuated by the larger diameter counterbore employed to accommodate all ejector means constituents other than the ejector pin. The result of this design flaw is a punch member having a shorter working life than the same piercing punch member having a more solid construction.
Although of lesser significance, the above discussion suggest a secondary disadvantage of the through hole design of the prior art. That is, this design requires the machining of a pair of holes, a bore of smaller diameter, and a counterbore of larger diameter. This design requirement adds complexity and expense to the manufacture and cost of the piercing punch member.
Another limitation of the typical piercing punch and ejector assembly of the prior art is the difficulty associated with disassembly of the ejector means during the periodic sharpenings of the cutting edge of the piercing punch member. This periodic sharpening is necessary to extend the life of the punch member. During this sharpening the ejector means, disposed in the bore and counterbore of the punch member, is removed. The removal and reinsertion of the ejector means requires total disassembly of the punch and die apparatus in that access to the counterbore end of the punch is required.
It is appreciated that ejector pin designs have been advanced that eliminate much of the difficulty involved in removal of the ejector means. Specifically, ejector pin designs have been developed in which only the ejector pin is removed, and thereafter reinstalled, during sharpening. In other designs, the ejector pin is held in the retracted position during sharpening. However, to provide this simplification in maintenance, a complex ejector means design must be employed. This adds significant complexity and cost to the punch and ejector assembly. Thus, the use of an ejector pin in a piercing punch and ejector assembly requires time consuming and labor intensive maintenance cost or, in the alternative, a highly complex and expensive design.
The complexity and expense of typical through hole designs is also evidenced by the need of these designs of the prior art to include a hole disposed normal to the bore or counterbore that provides venting. Without going into detail, suffice it to say, that the ejecting means employed in through hole designs create vacuum effects at the cutting edge of the punch member which requires this expensive remedy. Of course, the absence of such an expedient results in operating malfunctions resulting from the cut out blank adhering to the punch due to this vacuum effect.
A related problem, associated with the sharpening of piercing punch members, in the prior art is the limitation on the number of times the punch member may be rehoned before the punch member is discarded. Each time the punch member is resharpened its length is correspondingly decreased. Although this has no adverse effect on the typical ejector pin design in the unrestrained position, since it only causes the pin to extend further beyond the cutting edge surface, it has a very deleterious effect on the punch and ejector assembly in the retracted position. After enough resharpenings there is an insufficient length of bore to accommodate the ejector pin when the ejector means spring is compressed and the ejector pin retracted. Since ejector pins are manufactured in standard lengths, a new shorter pin cannot replace the original longer pin with the result that the whole assembly must be replaced.
In summary, the piercing punch and ejector assemblies of the prior art suffer from limitations in terms of their strength of construction, their difficult and time consuming maintenance requirements or complex and expensive design, and their limited effective working life.
BRIEF SUMMARY OF THE INVENTION
The instant invention is directed to a new piercing punch and ejector assembly which provides improved strength of construction, a simplified design which provides simplified and less time consuming maintenance and longer effective useful life. This is all accomplished in an improved assembly that employs a blind hole eliminating the through hole design of the prior art and that eliminates the need for an ejection pin which simplifies maintenance, decrease the cost of both the punch member and the ejection means and increases assembly working life.
In accordance with the present invention a piercing punch and ejector assembly is provided. It comprises a piercing punch member having a point thickness section provided with a longitudinal bore. An ejector member is also provided. It includes a conical helical spring of rectangular cross section disposed in said bore.
BRIEF DESCRIPTION OF THE DRAWINGS
The instant invention may be better understood by reference to the accompanying drawings of which:
FIG. 1 is a longitudinal cross sectional view of a preferred embodiment of the piercing punch and ejector assembly of this invention;
FIG. 2 is a detailed longitudinal cross sectional view of a portion of the assembly of FIG. 1;
FIG. 3 is a front elevational view of the conical helical spring of this invention;
FIG. 4 is a flat pattern isometric view of the spring of FIG. 3;
FIG. 5 is a longitudinal cross sectional view of the punch and ejector assembly in operation.
DETAILED DESCRIPTION
Turning now to the drawings in detail, a preferred embodiment of the piercing punch and ejector assembly of this invention is generally indicated at 1. The assembly 1 includes a piercing punch member depicted generally at 2. The piercing punch member 2 comprises a point thickness section 4, a body thickness section 6 and a shoulder thickness section 8.
The punch member 2 is characterized by a blind hole provided therein. The term "blind hole" is used to emphasize the fact that a bore 10 is provided only in the point thickness section 4 of the punch member 2. That is, an opening 10 extending from the cutting edge surface 7 upwards as high as the top of the point thickness section 4 of the member 2 is provided.
It is noted that the point thickness section 4 is that portion of the piercing punch member 2 having a thickness, most often a diameter, equal to the thickness of the cutting edge 7. Similarly the body thickness section 6 disposed above and integral with the point thickness section is characterized by a uniform thickness equal to that of the bulk of the punch member 2. The shoulder thickness section 8 is that uppermost section of the punch member 2 wherein the thickness is greatest defining the shoulder of the punch 2. The section 8 is integral with the point and body thickness sections, 4 and 6. The body and shoulder sections 6 and 8 are characterized by a solid shape since the bore 10 extends only within the point thickness section and there is no counterbore.
A unique feature of the assembly 1 is the inclusion of a plug or core 12 placed at the end of the bore 10 remote from the cutting edge surface 7. Whereas the punch member 2 is constructed of a hard metal, well known to those skilled in the art, the core 12 is formed of an easily drilled, soft material. Among the materials that can be used as the material of construction of the core 12 are aluminum, copper, cold rolled steel and plastics. Of these aluminum is particularly preferred.
The use of the core 12 provides the important advantage of extending the life of the punch member 2. Typically, the cutting edge 7 of the punch member 2 is periodically resharpened to extend the useful life of the punch. Although this expedient extends the punch life, the number of times such a procedure can be repeated is limited. When the repeated sharpenings diminish the bore 10 length to the extent that the ejector member (to be described below) cannot fully retract therein, the punch member 2 must be replaced. This is because the punch member 2 is constructed of a very hard metal, necessary to prevent structural failure during its operation. Thus, it is exceedingly difficult to drill into such a metal to extend the length of the bore 10.
The design of the piercing punch member 2 provided with the core 12 overcomes this problem. Obviously, it is quite simple to drill into the soft material core 12 resulting in an extension in the number of tixes the cutting edge 7 can be rehoned. It is important to appreciate that this method increases the number of times the punch member 2 can be resharpened without diminishing its structural strength. This is because the bore length need not ever be increased beyond its original length. The bore 10 need only be increased, by decreasing the length of the core 12 after continued sharpenings, to its original length.
The piercing punch and ejector assembly 1 includes an ejector means, generally indicated at 5. The ejector means 5 comprises a conical helical spring of rectangular cross section 9. The conical helical spring 9 is best depicted in FIG. 3. As seen in FIG. 3, the spring has an ever increasing diameter, resulting in a cone shaped appearance. In the drawings the small diameter end is denoted 14 and the opposite end, the large diameter end is denoted 16. A conical helical spring of rectangular cross section is particularly suited to this application. Unlike most forms of springs, this type spring can be squeezed. Thus, its maximum diameter, i.e., end 16, can exceed the diameter of the bore 10 and yet be capable of being placed into the bore 10. This permits the spring 9 to be held in the bore 10 without any holding means to anchor it in the bore 10. The spring action of the helical spring 9 holds the spring 9 firmly in the bore 10. Equally important, the absence of holding means eliminates the need for a counterbore, which in prior art designs is included to accommodate said holding means. This, in turn, eliminates the tubular design piercing punch, typical of many prior art designs, which include a through hole.
The conical helical spring of rectangular cross section 9 is additionally characterized by its ability to fold into itself such that its length can be reduced to that of its width, illustrated in the drawings at 18. The ability of the spring 9 to decrease its thickness to this significant degree, without adversely affecting its spring power imparts another significant advantage to the punch and ejector assembly 1. Because the ejector means length can be decreased the bore 10 can also be proportionately decreased without any deleterious effect. Therefore, the cutting edge surface 7 of the punch member 2 can be resharpened many times, even to the point of decreasing the length of the point thickness section 4, and hence, the length of the bore 10, without adversely affecting the operation of the assembly 1. Indeed, the bore 10 may be as short as the width 18 of the spring 9 and the assembly 1 will still function, since the retracted spring 9 will still be accommodated in the bore 10. This feature adds yet further useful life to the assembly even before the improved feature provided by the core 12 is put into effect.
The conical helical spring of rectangular cross section 9 is shown in a flat pattern view in FIG. 4. Its width 18 and thickness 19 defines its rectangular cross section. Its length 20 and helical angle 21 defines the shape of the cone depicted in FIG. 3. The material of construction of the spring 9 is most preferably a hard metal. Among the hard metals preferred for employment in this application are stainless steel, carbon steel, beryllium copper and phosphorus bronze.
As illustrated in FIG. 5, the piercing punch and ejector assembly 1, in a preferred embodiment, is held in a punch shoe 30 and punch retainer 40. The shoe 30 and retainer 40 are secured together by conventional means well known to those skilled in the art (not shown). A die retainer 50 and a die shoe 60, also secured together by conventional means (not shown), are in vertically aligned, spaced relationship with the punch shoe 30 and retainer 40 disposed thereabove. A die insert 52 is accommodated in the die retainer 50 as shown in the drawing. An opening 64 is cut into the die shoe 60 in vertical alignment with the punch member 2 and the die insert 52. A stripper plate 45 is located intermediate the punch retainer 40 and die retainer 50 and in vertical alignment therewith. The stripper plate 45 includes an opening 46 to permit movement of the punch member 2.
In operation, the material from which the plugs or blanks will be formed, the stock 70, is disposed upon the die retainer 50. As shown in FIG. 5, it is impacted by the cutting edge 7 of the punch member 2 which simultaneously compresses and retracts the spring 9 into the bore 10 such that the small diameter end 14 of the spring 9 is flush with the cutting edge surface 7 at the point of impact. The conical helical spring 9 remains in this retracted position until the punched out material, the plug or blank 72 is cut from the stock 70. The blank 72 is depicted in FIG. 5 in dotted line falling in the passageway formed by the opening in the die insert 52 and the opening 64 in the die shoe 60. After impact the compressive force on the spring 9 is removed and the conical spring 9 expands to the position shown in FIGS. 1 and 2. The expansion of the spring 9 to its equilibrium position provides the ejecting force in the event that the blank 72, for any reason, sticks to the cutting edge surface 7 of the punch member 2. The spring 9 dislodges the blank 72 from the cutting edge surface 7 insuring that the continuous operation of punching procedure is uninterrupted.
The above preferred embodiment is given to illustrate the scope and spirit of the instant invention. Other preferred embodiments, within the scope and spirit of this invention, are within the contemplation of the instant invention. The present invention, therefore, should be limited only by the appended claims.

Claims (7)

What is claimed is:
1. A piercing punch and ejector assembly comprising:
a piercing punch member having a point thickness section, said section provided with a longitudinal bore; and
an ejector member comprising a conical helical spring of rectangular cross section capable of being folded such that its length is reduceable to that of its width.
2. An assembly in accordance with claim 1 wherein said conical helical spring of rectangular cross section is fabricated of a metal selected from the group consisting of stainless steel, carbon steel, beryllium copper and phosphorous bronze.
3. An assembly in accordance with claim 1 wherein said spring extends beyond the cutting edge surface of said punch member in its equilibrium, non-retracted state.
4. An assembly in accordance with claim 3 wherein said piercing punch member includes:
a body thickness section, integral with and, disposed above said point thickness section; and
a shoulder thickness section, integral with and, disposed above said body thickness section;
said body thickness and shoulder thickness sections characterized by a solid shape.
5. An assembly in accordance with claim 1 including a core of a soft material disposed at the end of said bore remote from the cutting edge surface of said punch member.
6. An assembly in accordance with claim 5 wherein said soft material is selected from the group consisting of aluminum, copper, cold rolled steel and plastics.
7. An assembly in accordance with claim 6 wherein said soft material core is aluminum.
US06/301,951 1981-09-14 1981-09-14 Punch and ejector assembly Expired - Fee Related US4691602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/301,951 US4691602A (en) 1981-09-14 1981-09-14 Punch and ejector assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/301,951 US4691602A (en) 1981-09-14 1981-09-14 Punch and ejector assembly

Publications (1)

Publication Number Publication Date
US4691602A true US4691602A (en) 1987-09-08

Family

ID=23165616

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/301,951 Expired - Fee Related US4691602A (en) 1981-09-14 1981-09-14 Punch and ejector assembly

Country Status (1)

Country Link
US (1) US4691602A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5065926A (en) * 1989-04-07 1991-11-19 Bobst Sa Telescopic tool for stripping waste within a sheet processing machine
US5647256A (en) * 1995-02-20 1997-07-15 Mate Precision Tooling Inc. Punch unit including an adjustable punch
US5832798A (en) * 1994-08-10 1998-11-10 Mate Precision Tooling Inc. Punch unit
US5839341A (en) * 1996-04-12 1998-11-24 Mate Precision Tooling Punch unit
US6152812A (en) * 1999-07-08 2000-11-28 Chunghwa Pictures Tubes, Ltd. Punching machine for cutting glass
US20070283795A1 (en) * 2006-06-09 2007-12-13 Greenleaf Richard J Punch plug arrangement
US20090044671A1 (en) * 2006-06-09 2009-02-19 Greenleaf Richard J Punch press shedder pin knockout arrangement

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US115157A (en) * 1871-05-23 Improvement in cutters for cutting washers from leather
US389404A (en) * 1888-09-11 Ohaeles p
GB190321797A (en) * 1903-10-09 1903-11-26 Heinrich Bloch Improvements in Hand Stamping Tools.
US1940438A (en) * 1931-07-28 1933-12-19 Stanley Works Punch
AT163914B (en) * 1948-03-08 1949-09-10 Hubert Csermak Punch
US2545237A (en) * 1946-01-16 1951-03-13 Maby Per Gunnar Punching tool
US3063319A (en) * 1962-06-21 1962-11-13 Producto Machine Company Machine punch having ejector pin retaining means
US3190160A (en) * 1963-04-03 1965-06-22 American Drill Bushing Company Slug shedder
US3222968A (en) * 1963-05-06 1965-12-14 Producto Machine Company Machine punch having an ejector pin
US3379083A (en) * 1965-11-19 1968-04-23 Oberg Mfg Co Inc Machineable headed punch
US3459081A (en) * 1966-07-13 1969-08-05 Wirth W Kanode Die punch and slug ejector
US3504436A (en) * 1968-03-18 1970-04-07 Albert A Ebert Paper punch press tool
US3620113A (en) * 1969-09-08 1971-11-16 Dayton Progress Corp Ejector type punch

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US115157A (en) * 1871-05-23 Improvement in cutters for cutting washers from leather
US389404A (en) * 1888-09-11 Ohaeles p
GB190321797A (en) * 1903-10-09 1903-11-26 Heinrich Bloch Improvements in Hand Stamping Tools.
US1940438A (en) * 1931-07-28 1933-12-19 Stanley Works Punch
US2545237A (en) * 1946-01-16 1951-03-13 Maby Per Gunnar Punching tool
AT163914B (en) * 1948-03-08 1949-09-10 Hubert Csermak Punch
US3063319A (en) * 1962-06-21 1962-11-13 Producto Machine Company Machine punch having ejector pin retaining means
US3190160A (en) * 1963-04-03 1965-06-22 American Drill Bushing Company Slug shedder
US3222968A (en) * 1963-05-06 1965-12-14 Producto Machine Company Machine punch having an ejector pin
US3379083A (en) * 1965-11-19 1968-04-23 Oberg Mfg Co Inc Machineable headed punch
US3459081A (en) * 1966-07-13 1969-08-05 Wirth W Kanode Die punch and slug ejector
US3504436A (en) * 1968-03-18 1970-04-07 Albert A Ebert Paper punch press tool
US3620113A (en) * 1969-09-08 1971-11-16 Dayton Progress Corp Ejector type punch

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Marks Standard Handbook for Mechanical Engineers, 8th Edition, McGraw Hill Book Co., N.Y., pp. 8 77. *
Marks' Standard Handbook for Mechanical Engineers, 8th Edition, McGraw-Hill Book Co., N.Y., pp. 8-77.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5065926A (en) * 1989-04-07 1991-11-19 Bobst Sa Telescopic tool for stripping waste within a sheet processing machine
AU624698B2 (en) * 1989-04-07 1992-06-18 Bobst Sa Telescopic tool for a waste-ejection station in a sheet- working machine
US5832798A (en) * 1994-08-10 1998-11-10 Mate Precision Tooling Inc. Punch unit
US5647256A (en) * 1995-02-20 1997-07-15 Mate Precision Tooling Inc. Punch unit including an adjustable punch
US5839341A (en) * 1996-04-12 1998-11-24 Mate Precision Tooling Punch unit
US6152812A (en) * 1999-07-08 2000-11-28 Chunghwa Pictures Tubes, Ltd. Punching machine for cutting glass
US20070283795A1 (en) * 2006-06-09 2007-12-13 Greenleaf Richard J Punch plug arrangement
US20090044671A1 (en) * 2006-06-09 2009-02-19 Greenleaf Richard J Punch press shedder pin knockout arrangement

Similar Documents

Publication Publication Date Title
EP1100642B1 (en) Boring tool comprising a replaceable cutting insert which is secured against detaching
EP0118806B1 (en) Drilling tool with replaceable cutting bit
DE60005010T2 (en) SOCKET KEY AND METHOD FOR THE PRODUCTION THEREOF
EP2830799B1 (en) Drill bit
US3496818A (en) Guide bushing for die sets
US4691602A (en) Punch and ejector assembly
EP0278288A1 (en) Drilling tool for working materials producing long chips
EP0631835B1 (en) Cutting tool
DE69620854T2 (en) Device for the gradual feeding and punching of sheet-like materials
DE102016110193A1 (en) Turning tool with exchangeable cutting inserts
DE102009031193A1 (en) Deep-hole drill for inserting boreholes into work-pieces, has blade partitioned into partial cuts by chip divider, where cuts of blade are arranged together such that cut-normals are aligned to each other by cuts at angle of twenty degrees
DE69407129T2 (en) Stripping device and punch assembly with this device
DE1238743B (en) Drill head
EP1171259A1 (en) Method and device for fracture-separating a workpiece
DE19929652A1 (en) Facing cutter with milling body
EP3223983A1 (en) Machining tool
DE10144514A1 (en) cutting tool
US2927492A (en) Knurled piercing punch
EP0790387B1 (en) Rock drill bit and method of manufacturing same
DE2361846A1 (en) DEVICE FOR LOCKING AN ELEMENT IN A REQUIRED USE POSITION
DE19710996A1 (en) Drilling tool with cutting inserts
DE3206678C2 (en) Drilling tool for creating an undercut in a stone, masonry or the like. pre-drilled cylindrical blind hole
DE20210909U1 (en) drilling
EP0033086A1 (en) Drilling tool with indexable drill bit
EP0319748A1 (en) Precision drill

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

REMI Maintenance fee reminder mailed
FPAY Fee payment

Year of fee payment: 4

SULP Surcharge for late payment
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19950913

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362